SAT数学Problem Solving练习题（29）
- 2017年07月26日13:42 来源：互联网
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Question 29: Out of all of the houses characterized in the table below, what is the percentage of new ranches?
HousesOldNewTotal
Ranch23?30
Colonial?40?
Total23??
(a) 10%
(b) 12%
(c) 15%
(d) 25%
(e) 8%
Answer: The number of new ranches will be 30 - 23 = 7. We need to find the total number of houses.
The number of old colonials will be 23 - 23 = 0, and the total number of colonials will be 40 + 0 = 40.
The total number of houses will be the total number of ranches + the total number of colonials, 30 + 50 = 70. We can rewrite the table: HousesOldNewTotal
Ranch23730
Colonial04040
Total234770
The percentage of new ranches will be (7 / 70)·100 = 10%
